Extremely rare Swiss 18K gold lyra-shaped pendant watch Circa 1810

Gold, enamel, pearl- and diamond-set lyra-form watch
–
An extremely rare Swiss 18 carat gold, enamel, pearl- and diamond-set lyra-form pendant watch, circa 1810. Unsigned verge Breguet movement. Engraved and polychrome enamelled case, the back mainly translucent blue enamelled, with the representation of a sheet of music, the front translucent red enamelled, with a window for the balance wheel, surrounded with diamonds, additionally decorated with small pearls, hinged back, underneath the concealed white enamel dial with Arabic hours and outer minute divisions, filigree steel Breguet hands.
–
Length: 55 mm
–
Weight: 28 g
–
Signe: No name